The impact of tropospheric mapping function on PPP determination for one-month period

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Acta Geodynamica et Geomaterialia Pub Date : 2020-06-24 DOI:10.13168/agg.2020.0018

S. Nistor

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引用次数: 5

Abstract

When using the PPP method, it is recommended to take into account the tropospheric influences for obtaining reliable estimates. Global Navigation Satellite System (GNSS) observations taken at low elevation suffer more strongly from atmospheric, antenna phase center variation and multipath effects, hence the observations are noisier than those at higher elevation angle, but they are essential to decorrelate the estimated station height and tropospheric zenith delay (ZTD). To relate the ZTD in the direction of an observation, the so-called mapping function (MF) are used. In this article the influence of different mapping function was studieds such as: Niell mapping function (NMF), Global Mapping Function (GMF) in conjunction with the Global Pressure and Temperature 2 -GPT2, Vienna Mapping Function 1 and no mapping function. The MF were used at different elevation cutoff angles – 50, 70, 100 and 150. The impact was analyzed: a) on the postfit residuals of the ionospheric free combination for phase (LC) and for pseudorange (PC), b) daily variability for North, East and Up component; c) evaluation of coordinates repeatability and how they are affected by the changes of the cutoff elevation angle and mapping function. The analyzed data was taken from 4 EUREF stations for a period of one month October 2015. By using the VMF1 mapping function, the lowest value was obtained for the postfit residuals of the LC combination for all the stations. The difference in daily variation between each individual solution for the horizontal component is at the level of ~0.3 ÷ 0.5 mm, with smaller effect on the East component compared to North, whereas the Up component is at the level of ~1.0 ÷ 1.5 mm. The standard deviation (SD) is used as a measure of station position repeatability and the results suggested that for high precision determination a cutoff elevation angle of 100 should be used. Although at low elevation 50 and 70 – the VMF1 performs better than the GMF/GPT2 and NMF, after 100 the GMF/GPT2 is strongly in agreement with VMF1 and after 150 the NMF shows similar results as VMF1 and GMF/GPT2. ARTICLE INFO

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对流层制图功能对一个月PPP确定的影响

在使用购买力平价方法时，建议考虑对流层的影响，以获得可靠的估计。全球导航卫星系统(GNSS)低海拔观测数据受大气、天线相位中心变化和多径效应的影响更大，因此观测数据比高海拔观测数据噪声更大，但它们对解相关估算站高和对流层天顶延迟(ZTD)至关重要。为了在观测方向上关联ZTD，使用了所谓的映射函数(MF)。本文研究了Niell映射函数(NMF)、Global mapping function (GMF)结合Global Pressure and Temperature 2 -GPT2、Vienna mapping function 1、no mapping function等不同映射函数的影响。在不同的仰角截止角- 50、70、100和150时使用MF。分析了其影响:a)对相位(LC)和伪距(PC)的电离层自由组合的拟合后残差，b)北、东、上分量的日变率;C)评价坐标的可重复性，以及它们如何受到截止仰角和成图函数变化的影响。所分析的数据来自4个EUREF站点，时间为2015年10月的一个月。利用VMF1映射函数，得到所有站点LC组合的后拟合残差的最小值。水平分量各单项溶液的日变化差为~0.3 ÷ 0.5 mm，东分量的影响小于北分量，而上分量的日变化差为~1.0 ÷ 1.5 mm。采用标准偏差(SD)作为测站位置重复性的度量，结果表明，为实现高精度测定，应采用100的截止仰角。虽然在低海拔50和70 -时，VMF1的表现优于GMF/GPT2和NMF，但在100 -后，GMF/GPT2与VMF1非常一致，而在150 -后，NMF的结果与VMF1和GMF/GPT2相似。条信息

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来源期刊

Acta Geodynamica et Geomaterialia 地学-地球化学与地球物理

CiteScore

2.30

自引率

0.00%

发文量

期刊介绍： Acta geodynamica et geomaterialia (AGG) has been published by the Institute of Rock Structures and Mechanics, Czech Academy of Sciences since 2004, formerly known as Acta Montana published from the beginning of sixties till 2003. Approximately 40 articles per year in four issues are published, covering observations related to central Europe and new theoretical developments and interpretations in these disciplines. It is possible to publish occasionally research articles from other regions of the world, only if they present substantial advance in methodological or theoretical development with worldwide impact. The Board of Editors is international in representation.